Nut-lock.



PATENTED MAY 7, 1907.

F. E. BARTZ.

NUT LOCK.

APPLICATION FILED FEB. 23. 1907.

EE E [NVENTOR W JTNESSES UNITED STATES PATENT oFFIo E. FRANK E. BARTZ,OF JAOKSON CENTER, PENNSYLVANIA.

NUT-LOCK.

Specification of Letters Patent.

A pli ation med February 23, 1907. Serial No. 358.889.

Patented May 7. 1907.

To all whom it may concern.-

Be it known that I, FRANK E. BAR'rz, a .citizen of the United States ofAmerica, residing at Jackson Center, in the county of Mercer and Stateof Pennsylvania, have invented certain new and useful Improvements inNut-Locks, of which the following is a'specification, reference beinghad therein to the accompanying drawing. i

This invention relates to nut locks, and its object is to provide asimple, inexpensive and effective device of this characterso constructedas to prevent the loosening of the nuts on a bolt.

The invention comprises a bolt formed with a right hand thread, and aleft hand thread, in combination with two co-operating nuts of novelconstruction, and a yielding washer interposed between the nuts. Theconstruction of the improvement will I be fully described hereinafter inconnection with the accompanyingdr'awing which forms a part of thisspecification, and its novel features will be defined in the appendedclaimsl In the drawing, Figure 1 is a view partly in elevation andpartly in section of a bolt and nut lock embodying the invention, Fig. 2is an. elevationof the bolt with the nuts and washer removed, Fig. 3 is.a transverse sec.- tion' of one of the nuts emplo ed, Fig. {1 is anelevation of the outer face 0 the nut shown I in Fig. 3, Fig. 5 .is'a;sectional view'of the outer nut, 'Fig. ,6 is an elevation of the innerface of the outer nut, ig. 7, is a section of the 5 rubber washer, andFigs-8 is an elevation of the same. v The reference numerall'designatesa bolt having a head 2, andformd with a, right hand thread3. The end-4 of the'bolt is aircumferentially reduced and formed withleft hand screw-threads.

The reference numeral 5 designates a nut having its bore formed withthreads corre spondlng to thethreads 3 of the bolt. The nut 5 isrecessed on its outer face, which recess is formed by cutting away thenut from one side to a point approximately to the center of the nut, theouter face 7 of the nut 5 both in the recessed portion thereof and theprojecting part or ortion of the outer face of this nut being inc ined,the recessing of the nut on its outer face producing shoulders 66 bothin saidnut.

In connection with the nut 5, I employ an outer; nut 8 the bore of whichis formed with left hand threads 9 corresponding to the threads on theend 4of the bolt. The inner face of the out 8 is countersunk around theinner end of the threaded bore, to provide a circular seat 10, and saidinner face of the nut is also formed with a plurality of tangentialslots 11 extending from the countersunk seat 10 to the outer edges ofthenut.

The rubber washer 12 is interposed between the two nuts 5 and 8 and saldwasher fits Within the seat 10 of the outer nut said seat being howeverof less width than the jects beyond the inner face of the nut 8 againstthe shoulders 6 of the nut 5. When the outer nut 8 is screwed tightlyupon the threadedend 4 of the bolt, the rubber washer is forced into theinner ends of the slots 1 1 of the outer nut thus firmly locking bothof'the nuts against movement.

It Wlll be a parent from the illustration in Fig. 1 of the d rawing, inconnection with the fore oing description, that the "washer secure yholds. both nuts, and that any tendency of either nut to turn isovercome'by the engagement therewith of the yielding washer.

What I claim and desire to secure by Letters Patent, is

1.. The combination with a bolt, of an inner and an outer .nut thereon,the inner nut provided on its outer face with an inclined surface andbeing recessed to form shoulders at opposite sides of the bore of thenut, the outer nutprovided on its inner face with an annular recesssurrounding the bore of the nut and with slo ts extending tangentiallyto the axis of said nut, and a rubber washer seated in the annularrecess of said outer nut and extending beyond the inner face of saidouter. nut and adapted to be compressed into the recessed portion of theinner nut and the slots of said outer nut 2. The combination with a boltformed with a ri hthand thread and a left'hand thread, 0- an inner nutengaging the right hand thread of said bolt being recessed on its outerface, and having an inclined surface on said outer'face, an outer nutmounted on the left hand thread of said bolt and provided on its inner,face with an annular recess surrounding the bore of the nut and alsoprovided on said inner-face with slots, and a rubber washersea'ted in'said annular recess and extending beyond the inner face of said outernut and adapted-to be compressedinto the thickness ofthe washer so thatthe latter pro- 7 IIO recessed outer face of the inner nut-and the 1slots on the inner face of the outer nut.

3. The combination witha bolt formed l interposed between said nuts andengaging with a ri ht hand thread and a left hand thread, of an innernut formed with a right hand thread, and recessed on its outer face toprovide an inclined surface and shoulders on opposite sides of the boreof the nut, an outer nut formed with a left hand thread, and recessed onits inner face to provide a washer seat, and having slots extendingtangentially 1o to the bore of thenut, and a yielding Washer in saidslots against the shoulders of the inner nut.

In testimony whereof I a'l'lix signaturein the presence of twoWitnesses.

' FRANK E. BARTZ. Witnesses:

H. C. EVERT, F. O. MCCUEARY.

